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src/Policy/StellaOps.Policy.Engine/Endpoints/ConsoleSimulationEndpoint.cs

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+using Microsoft.AspNetCore.Mvc;
+using StellaOps.Policy.Engine.ConsoleSurface;
+
+namespace StellaOps.Policy.Engine.Endpoints;
+
+internal static class ConsoleSimulationEndpoint
+{
+    public static IEndpointRouteBuilder MapConsoleSimulationDiff(this IEndpointRouteBuilder routes)
+    {
+        routes.MapPost("/policy/console/simulations/diff", HandleAsync)
+            .WithName("PolicyEngine.ConsoleSimulationDiff")
+            .Produces<ConsoleSimulationDiffResponse>(StatusCodes.Status200OK)
+            .ProducesValidationProblem();
+
+        return routes;
+    }
+
+    private static IResult HandleAsync(
+        [FromBody] ConsoleSimulationDiffRequest request,
+        ConsoleSimulationDiffService service)
+    {
+        if (request is null)
+        {
+            return Results.ValidationProblem(new Dictionary<string, string[]>
+            {
+                ["request"] = new[] { "Request body is required." }
+            });
+        }
+
+        if (request.EvaluationTimestamp == default)
+        {
+            return Results.ValidationProblem(new Dictionary<string, string[]>
+            {
+                ["evaluationTimestamp"] = new[] { "evaluationTimestamp is required." }
+            });
+        }
+
+        if (string.IsNullOrWhiteSpace(request.BaselinePolicyVersion) || string.IsNullOrWhiteSpace(request.CandidatePolicyVersion))
+        {
+            return Results.ValidationProblem(new Dictionary<string, string[]>
+            {
+                ["policyVersion"] = new[] { "baselinePolicyVersion and candidatePolicyVersion are required." }
+            });
+        }
+
+        var response = service.Compute(request);
+        return Results.Json(response);
+    }
+}